Extrapolation of upwelling irradiance just beneath the ocean surface from the in-water radiometric profile measurements

Shaoqi GONG

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Extrapolation of upwelling irradiance just beneath the ocean surface from the in-water radiometric profile measurements

Physics | Updated：2024-10-14

- Extrapolation of upwelling irradiance just beneath the ocean surface from the in-water radiometric profile measurements
- Extrapolation of upwelling irradiance just beneath the ocean surface from the in-water radiometric profile measurements
- 海洋湖沼学报(英文) 2023年41卷第5期页码：1694-1705
- Affiliations：
  
  School of Remote Sensing and Geomatics Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
- Author bio：
  
  shaoqigong@163.com
- Funds：
  
  the Marine Special Program of Jiangsu Province in China(JSZRHYKJ202007);the National Natural Science Foundation of China(40801145)
- DOI：
  中图分类号：
- 收稿：2022-04-21，
  
  录用：2022-06-01，
  
  网络首发：2022-07-18，
  
  纸质出版：2023-09-01
- Accepted：
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Extrapolation of upwelling irradiance just beneath the ocean surface from the in-water radiometric profile measurements[J]. 海洋湖沼学报(英文), 2023,41(5):1694-1705.

GONG Shaoqi.Extrapolation of upwelling irradiance just beneath the ocean surface from the in-water radiometric profile measurements[J].Journal of Oceanology and Limnology,2023,41(05):1694-1705.
Extrapolation of upwelling irradiance just beneath the ocean surface from the in-water radiometric profile measurements[J]. 海洋湖沼学报(英文), 2023,41(5):1694-1705. DOI：

GONG Shaoqi.Extrapolation of upwelling irradiance just beneath the ocean surface from the in-water radiometric profile measurements[J].Journal of Oceanology and Limnology,2023,41(05):1694-1705. DOI：

摘要

Abstract

Accurate measurements of upwelling irradiance just beneath the ocean surface

(

)

can be used to calculate ocean optical parameters

and further develop retrieval algorithms for remotely sensing water component concentrations. Due to the effects of sea surface waves

perturbation from instrument platform (ship)

and instrument self-shading

(

) is often difficult to be accurately measured. This study presents a procedure for extrapolating the

(

) from the in-water radiometric profile measurements. Using the optical profile data from 13 bands (ranging from 381 to 779 nm) measured by 45 casts in the Ligurian Sea during 2003–2009

the

(

) was extrapolated from in-water upwelling irradiance measurements between the initial shallow depth

and an optimal bottom depth

by three linear models (linear

2-degree polynomial

and exponentia

l) and two nonlinear models (LOESS and spline). The accumulated errors of extrapolated

(

) at each wavelength for the five models were calculated. It was found that the optimal

depth for the linear and exponential models was at the depth of 80% of

(

)

50% of

(

) for the 2-degree polynomial model

40% of

(

) for the LOESS model

and 15% of

(

) for the spline model. The extrapolated

(

) derived from the five models was in good agreement with the calculated true

(

). In all bands

the 2-degree polynomial model achieved the highest accuracy

followed by the LOESS model. In the short band of 381–559 nm

the linear and exponential models had the third-best performance

and the spline model performed worst within this range. For the red band of 619–779 nm

the accuracies of the exponential and spline models had the third highest performance

and the linear model produced lowest accuracy. Hence

the 2-degree polynomial model was an optimal procedure for extrapolation of

(

) from the in-water radiometric profile measurements.

关键词

Keywords

references

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